远场水下爆炸作用下平板的冲击响应仿真

Numerical Simulation of Plate Response Subject to Far-field Underwater Explosion

为了对舰船水下防护结构设计提供参考,采用LS-DYNA软件中的声固耦合法对远场水下爆炸作用下平板的冲击响应问题进行了模拟,计算结果与公认的双渐进近似算法计算结果较为接近。计算模型中采用了空化声单元和粘性非反射边界,并对比了网格加密、不同水柱高度和是否考虑空化的影响。LS-DYNA的声固耦合法计算速度快,计算准确度接近公认的双渐进近似算法,为国内水下爆炸数值计算人员提供了一种新的思路和计算工具。

Acoustic-structure interaction method in LS-DYNA software was used to solve plate response subject to far-field underwater ex- plosion. Cavitation acoustic finite element （CAFE） and non-reflecting boundary were used in UNDEX models. Results with different fluid mesh density, different length of fluid column, with or without CAFE effects were compared with DAA results. This kind of method could offer significant savings in computational time over DAA without greatly affecting accuracy of results.